Pivaloyl chloride → HCID 15538832, compound

Participants

Reaction Steps

Alkene 1b (2 g, 8.6 mmol) was dissolved in 50 mL of dry CH2Cl2 with 2.4 mL of anhydrous triethylamine. The flask was purged with argon and cooled in an ice bath. Pivaloyl chloride (1.6 g, 2 eq.) was added dropwise over one hour. The cooling bath was removed and stirring continued for 3 hours at room temperature. The solution was washed with aq. K2CO3 and then water, dried over MgSO4 and evaporated. The residue was purified by column chromatography on silica gel, eluting with 5% triethylamine in hexane yielding 1.95 g of dioxetane 1e: 1H NMR (CDCl3) δ 7.34-6.98 (m, 4H), 3.198 (s, 3H), 2.47 (sept, 1H), 2.33 (sept, 1H), 1.36 (s, 9H), 1.24 (d, 6H, J=6.9 Hz), 0.92 (d, 6H, J=6.9 Hz).

Provenance & Evidence